Radial-breathing mode frequencies for nanotubes encapsulating fullerenes

Isosurfaces of more negatively charged (electron rich) area, Δρ−, and that of more positively charged area, Δρ+, than a simple sum of two-self consistent charge densities of the (11, 11) nanotube and C60. Pink and cyan isosurfaces denote the electron-rich and -poor regions.